Address code review

Author: corona10

Include/cpython/unicodeobject.h

@@ -132,21 +132,25 @@ typedef struct {
              * all characters are in the range U+0000-U+10FFFF
              * at least one character is in the range U+10000-U+10FFFF
          */
-        unsigned int kind:3;
+        unsigned char kind:3;
         /* Compact is with respect to the allocation scheme. Compact unicode
            objects only require one memory block while non-compact objects use
            one block for the PyUnicodeObject struct and another for its data
            buffer. */
-        unsigned int compact:1;
+        unsigned char compact:1;
         /* The string only contains characters in the range U+0000-U+007F (ASCII)
            and the kind is PyUnicode_1BYTE_KIND. If ascii is set and compact is
            set, use the PyASCIIObject structure. */
-        unsigned int ascii:1;
+        unsigned char ascii:1;
         /* The object is statically allocated. */
-        unsigned int statically_allocated:1;
+        unsigned char statically_allocated:1;
         /* Padding to ensure that PyUnicode_DATA() is always aligned to
-           4 bytes (see issue #19537 on m68k). */
-        unsigned int :18;
+           4 bytes (see issue #19537 on m68k) and we use unsigned char to avoid
+           the extra four bytes on 32-bit Windows. This is restricted features
+           for specific compilers including GCC, MSVC, Clang and IBM's XL compiler. */
+        unsigned char :2;
+        unsigned char :8;
+        unsigned char :8;
     } state;
 } PyASCIIObject;
 

Lib/test/test_str.py

@@ -2450,8 +2450,6 @@ def test_expandtabs_optimization(self):
 
     def test_raiseMemError(self):
         asciifields = "nnb"
-        if not support.is_wasi:
-            asciifields = asciifields + "7x"
         compactfields = asciifields + "nP"
         ascii_struct_size = support.calcobjsize(asciifields)
         compact_struct_size = support.calcobjsize(compactfields)

Lib/test/test_sys.py

@@ -1763,8 +1763,6 @@ class newstyleclass(object): pass
                    '\U00010000'*30, '\U0010ffff'*100]
         # also update field definitions in test_unicode.test_raiseMemError
         asciifields = "nnb"
-        if not support.is_wasi:
-            asciifields = asciifields + "7x"
         compactfields = asciifields + "nP"
         unicodefields = compactfields + "P"
         for s in samples: